'Scott Pilgrim' premiere

David Livingston / Getty Images

Mary Elizabeth Winstead at the premiere. As the unattainable and fetching Ramona Flowers in "Scott Pilgrim vs. the World," she changes her hair color every week in the film, but Winstead went for a natural look at the film's premiere.

Mary Elizabeth Winstead at the premiere. As the unattainable and fetching Ramona Flowers in "Scott Pilgrim vs. the World," she changes her hair color every week in the film, but Winstead went for a natural look at the film's premiere. (David Livingston / Getty Images)

Mary Elizabeth Winstead at the premiere. As the unattainable and fetching Ramona Flowers in "Scott Pilgrim vs. the World," she changes her hair color every week in the film, but Winstead went for a natural look at the film's premiere.